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CVE-2026-116166

SiYuan 3.6.0 before 3.8.7 Cleartext Transmission via Unenforced networkServeTLS Setting

MEDIUM
6.8
CVSS Score
Published: October 25, 2026 at 01:20 PM UTC
Updated: October 25, 2026 at 02:16 PM UTC
1 product affected across 1 vendorSiyuan

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.1%

Description

SiYuan 3.6.0 before 3.8.7 accepts and persists the networkServeTLS setting but never enforces it, so the kernel port keeps serving full API access over plain HTTP alongside HTTPS. Network-adjacent attackers can sniff the cleartext login flow and session cookie, which lacks the Secure attribute while responses omit HSTS, to hijack kernel API sessions.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Siyuan· Siyuan Notego
90%
3.6.0
Vendor states this is fixed in 3.8.7 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hpj5-f7cj-vvwr
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/siyuan-3.6.0-before-3.8.7-cleartext-transmission-via-unenforced-networkservetls-setting

CVSS

6.8MEDIUMVulnCheck
Attack Vector
ADJACENT_NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-319

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